Abstract
The mechanically treated high temperature (700°C) oxidation of commercially pure titanium was studied for long exposures (3000 h). The treatments studied here are the shot-peening and the laser-shock peening. The mass gain was measured by discontinued weighing. SEM and Raman imaging revealed strong differences between laser-shock peened, shot-peened and untreated oxidized samples. The laser treatment leads to thin compact and protective oxide layer while the shot-peened and untreated samples exhibit cracked oxide layers. The distribution of light elements like carbon, oxygen and nitrogen was revealed by Ion Beam Analysis. The presence of nitrogen located at the interface between the oxide scale and the metal was revealed on laser-shock peened samples. It is supposed the nitrogen slows-down the oxygen diffusion into the metal. The extent of the oxygen-enriched metal is also smaller on LSP samples, which improves the ductility of titanium.
Highlights
Titanium and titanium alloys have been widely used in aerospace industry for many years as material having light weight, high strength and excellent corrosion resistance up to 500°C (1) (2)
The growth of an oxide scale on the surface of titanium is accompanied by inward diffusion of oxygen which leads to the formation of a hard and brittle oxygen enriched layer beneath the scale, known as “α-case” (3)
Many works have been devoted to the improvement of the mechanical properties of Ti alloys by mechanical surface treatments (5) (6) (7) (8) (9), but very few works have been focused on the high temperature (HT) oxidation behaviour
Summary
Titanium and titanium alloys have been widely used in aerospace industry for many years as material having light weight, high strength and excellent corrosion resistance up to 500°C (1) (2). In the case of oxidation in air, Coddet and Chaze (4) reported that the presence of atmospheric nitrogen can reduce the penetration of oxygen into the metal compared to oxidation in pure oxygen. Shot-peening treatments by SMAT (Surface Mechanical Attrition Technique) have shown their capability to improve the high temperature oxidation behaviour of zirconium (10). Studied the influence of shot-peening and laser-shock peening treatments on the high temperature resistance of pure titanium in dry air. The decrease of both the oxide scale thickness and the oxygen diffusion depth in LSP treated titanium plates was shown (14) (15) (16). The results obtained in this way are correlated here with those obtained by scanning electron microscopy, and micro-Raman spectroscopy in order to explain the benefits of the LSP treatment on the high temperature oxidation resistance of titanium
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